How come my Microsoft Lumia 950 not recognized by the File Explorer?

It has been quite strange the way Windows 10 works.

Few days ago Windows 10 was updated to Insider Preview Build 17692.rs_prerelease-flt.180625-1624 and now I cannot see my Microsoft Lumia 950 connected to the USB (there are three on this laptop) in the file explorer.

It is strange that I can connect to Flash Drives and WD's My Passport 1 TB drive connected to the USB drives.

Even stranger is, the fact that I can deploy UWP (Universal Windows Platform) projects from Visual Studio Community 2017 to the Microsoft Lumia 950 connected to the USB Drive.

I have done a hardware troubleshooting and restarted the laptop.

Still no good.

If I find a fix I will psot here for those who may hit the same wall.

Where do you find the MAC address on a smartphone?

In order to access Hotspot provided by your internet provider you may have to register your phones with the service provider. You will also require your userid and password. The provider would ask for the MAC (Machine Access Control) address of your phone. MAC address is also called Physical Address. Normally this is found in the settings of your phone.

For Windows Phone Microsoft Lumia 950 it is found under:
Settings---About---Device Information--MAC ADDRESS
With the following format:
Mac Address: 33-F3-8D-99-0A-99 (some fictitious address)

For Apple iPhone 6S it is found under:
Settings-----General----About---;Wi-Fi address
with the format similar to the above.
Wi-Fi address: 33:F3:8D:99:0A:99 (some fictitious address)

You better don't give away your MAC address to anybody as it is unique for a phone. If somebody spoofs it and commits something inappropriate you could be blamed for it.